Newsletter from 11.12.2020 | Last changed: 11.12.2020
… is best for healthy air Regular short bursts of ventilation through wide open windows provide fresh air low in viruses Source: Wavebreakmedia / iStockphoto … for about five minutes every 20 minutes and during all breaks with windows wide open. Mobile devices for air purification are less effective. They are generally … only suitable as a supplement to ventilation if the windows in classrooms cannot be opened sufficiently and if supportive, simple supply and exhaust air systems that …